/*
 * Copyright 1999-2000 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package com.googlecode.streamflyer.regex.fast;

/**
 * Utility class that implements the standard C ctype functionality.
 * 
 * @author Hong Zhang
 */

final class ASCII {

	static final int UPPER = 0x00000100;

	static final int LOWER = 0x00000200;

	static final int DIGIT = 0x00000400;

	static final int SPACE = 0x00000800;

	static final int PUNCT = 0x00001000;

	static final int CNTRL = 0x00002000;

	static final int BLANK = 0x00004000;

	static final int HEX = 0x00008000;

	static final int UNDER = 0x00010000;

	static final int ASCII = 0x0000FF00;

	static final int ALPHA = (UPPER | LOWER);

	static final int ALNUM = (UPPER | LOWER | DIGIT);

	static final int GRAPH = (PUNCT | UPPER | LOWER | DIGIT);

	static final int WORD = (UPPER | LOWER | UNDER | DIGIT);

	static final int XDIGIT = (HEX);

	private static final int[] ctype = new int[] { CNTRL, /* 00 (NUL) */
	CNTRL, /* 01 (SOH) */
	CNTRL, /* 02 (STX) */
	CNTRL, /* 03 (ETX) */
	CNTRL, /* 04 (EOT) */
	CNTRL, /* 05 (ENQ) */
	CNTRL, /* 06 (ACK) */
	CNTRL, /* 07 (BEL) */
	CNTRL, /* 08 (BS) */
	SPACE + CNTRL + BLANK, /* 09 (HT) */
	SPACE + CNTRL, /* 0A (LF) */
	SPACE + CNTRL, /* 0B (VT) */
	SPACE + CNTRL, /* 0C (FF) */
	SPACE + CNTRL, /* 0D (CR) */
	CNTRL, /* 0E (SI) */
	CNTRL, /* 0F (SO) */
	CNTRL, /* 10 (DLE) */
	CNTRL, /* 11 (DC1) */
	CNTRL, /* 12 (DC2) */
	CNTRL, /* 13 (DC3) */
	CNTRL, /* 14 (DC4) */
	CNTRL, /* 15 (NAK) */
	CNTRL, /* 16 (SYN) */
	CNTRL, /* 17 (ETB) */
	CNTRL, /* 18 (CAN) */
	CNTRL, /* 19 (EM) */
	CNTRL, /* 1A (SUB) */
	CNTRL, /* 1B (ESC) */
	CNTRL, /* 1C (FS) */
	CNTRL, /* 1D (GS) */
	CNTRL, /* 1E (RS) */
	CNTRL, /* 1F (US) */
	SPACE + BLANK, /* 20 SPACE */
	PUNCT, /* 21 ! */
	PUNCT, /* 22 " */
	PUNCT, /* 23 # */
	PUNCT, /* 24 $ */
	PUNCT, /* 25 % */
	PUNCT, /* 26 & */
	PUNCT, /* 27 ' */
	PUNCT, /* 28 ( */
	PUNCT, /* 29 ) */
	PUNCT, /* 2A * */
	PUNCT, /* 2B + */
	PUNCT, /* 2C , */
	PUNCT, /* 2D - */
	PUNCT, /* 2E . */
	PUNCT, /* 2F / */
	DIGIT + HEX + 0, /* 30 0 */
	DIGIT + HEX + 1, /* 31 1 */
	DIGIT + HEX + 2, /* 32 2 */
	DIGIT + HEX + 3, /* 33 3 */
	DIGIT + HEX + 4, /* 34 4 */
	DIGIT + HEX + 5, /* 35 5 */
	DIGIT + HEX + 6, /* 36 6 */
	DIGIT + HEX + 7, /* 37 7 */
	DIGIT + HEX + 8, /* 38 8 */
	DIGIT + HEX + 9, /* 39 9 */
	PUNCT, /* 3A : */
	PUNCT, /* 3B ; */
	PUNCT, /* 3C < */
	PUNCT, /* 3D = */
	PUNCT, /* 3E > */
	PUNCT, /* 3F ? */
	PUNCT, /* 40 @ */
	UPPER + HEX + 10, /* 41 A */
	UPPER + HEX + 11, /* 42 B */
	UPPER + HEX + 12, /* 43 C */
	UPPER + HEX + 13, /* 44 D */
	UPPER + HEX + 14, /* 45 E */
	UPPER + HEX + 15, /* 46 F */
	UPPER + 16, /* 47 G */
	UPPER + 17, /* 48 H */
	UPPER + 18, /* 49 I */
	UPPER + 19, /* 4A J */
	UPPER + 20, /* 4B K */
	UPPER + 21, /* 4C L */
	UPPER + 22, /* 4D M */
	UPPER + 23, /* 4E N */
	UPPER + 24, /* 4F O */
	UPPER + 25, /* 50 P */
	UPPER + 26, /* 51 Q */
	UPPER + 27, /* 52 R */
	UPPER + 28, /* 53 S */
	UPPER + 29, /* 54 T */
	UPPER + 30, /* 55 U */
	UPPER + 31, /* 56 V */
	UPPER + 32, /* 57 W */
	UPPER + 33, /* 58 X */
	UPPER + 34, /* 59 Y */
	UPPER + 35, /* 5A Z */
	PUNCT, /* 5B [ */
	PUNCT, /* 5C \ */
	PUNCT, /* 5D ] */
	PUNCT, /* 5E ^ */
	PUNCT | UNDER, /* 5F _ */
	PUNCT, /* 60 ` */
	LOWER + HEX + 10, /* 61 a */
	LOWER + HEX + 11, /* 62 b */
	LOWER + HEX + 12, /* 63 c */
	LOWER + HEX + 13, /* 64 d */
	LOWER + HEX + 14, /* 65 e */
	LOWER + HEX + 15, /* 66 f */
	LOWER + 16, /* 67 g */
	LOWER + 17, /* 68 h */
	LOWER + 18, /* 69 i */
	LOWER + 19, /* 6A j */
	LOWER + 20, /* 6B k */
	LOWER + 21, /* 6C l */
	LOWER + 22, /* 6D m */
	LOWER + 23, /* 6E n */
	LOWER + 24, /* 6F o */
	LOWER + 25, /* 70 p */
	LOWER + 26, /* 71 q */
	LOWER + 27, /* 72 r */
	LOWER + 28, /* 73 s */
	LOWER + 29, /* 74 t */
	LOWER + 30, /* 75 u */
	LOWER + 31, /* 76 v */
	LOWER + 32, /* 77 w */
	LOWER + 33, /* 78 x */
	LOWER + 34, /* 79 y */
	LOWER + 35, /* 7A z */
	PUNCT, /* 7B { */
	PUNCT, /* 7C | */
	PUNCT, /* 7D } */
	PUNCT, /* 7E ~ */
	CNTRL, /* 7F (DEL) */
	};

	static int getType(int ch) {
		return ((ch & 0xFFFFFF80) == 0 ? ctype[ch] : 0);
	}

	static boolean isType(int ch, int type) {
		return (getType(ch) & type) != 0;
	}

	static boolean isAscii(int ch) {
		return ((ch & 0xFFFFFF80) == 0);
	}

	static boolean isAlpha(int ch) {
		return isType(ch, ALPHA);
	}

	static boolean isDigit(int ch) {
		return ((ch - '0') | ('9' - ch)) >= 0;
	}

	static boolean isAlnum(int ch) {
		return isType(ch, ALNUM);
	}

	static boolean isGraph(int ch) {
		return isType(ch, GRAPH);
	}

	static boolean isPrint(int ch) {
		return ((ch - 0x20) | (0x7E - ch)) >= 0;
	}

	static boolean isPunct(int ch) {
		return isType(ch, PUNCT);
	}

	static boolean isSpace(int ch) {
		return isType(ch, SPACE);
	}

	static boolean isHexDigit(int ch) {
		return isType(ch, HEX);
	}

	static boolean isOctDigit(int ch) {
		return ((ch - '0') | ('7' - ch)) >= 0;
	}

	static boolean isCntrl(int ch) {
		return isType(ch, CNTRL);
	}

	static boolean isLower(int ch) {
		return ((ch - 'a') | ('z' - ch)) >= 0;
	}

	static boolean isUpper(int ch) {
		return ((ch - 'A') | ('Z' - ch)) >= 0;
	}

	static boolean isWord(int ch) {
		return isType(ch, WORD);
	}

	static int toDigit(int ch) {
		return (ctype[ch & 0x7F] & 0x3F);
	}

	static int toLower(int ch) {
		return isUpper(ch) ? (ch + 0x20) : ch;
	}

	static int toUpper(int ch) {
		return isLower(ch) ? (ch - 0x20) : ch;
	}

}
